Table 66 



Harrisville Harbor Breakwaters 



Harrisville, Michigan 



Date (s) Construction and Rehabilitation History 



1959 Construction of a 360-ft-long north breakwater and a 2 , 170-f t-long 



south breakwater was coinple'"ed (Figure 179). The breakwater was con- 

 structed of rubble-mound materials with cover stones ranging to 3 

 (min) and 5 tons (mln) for Types III and IV and Types I and II struc- 

 tures, respectively (Figure 179). The lakeward end of the south 

 breakwater (Type I) had a crest el of +10 ft Iwd, and the remaining 

 portions of the structure (Types II, III, and IV) had a crest el of 

 +8.0 ft Iwd. The crest width was about 7.5 ft; and side slopes on 

 the lakeside of the breakwaters were 1V:1.75H, while side slopes on 

 the harbor side were 1V:1.5H. Toe stone ranged from 5 tons (min) in 

 Types III and IV to 7 tons (min) in Types I and II. 



1971 Replenishment of cover stone on the breakwaters was accomplished. 



1984 An inspection of the breakwaters revealed some winter storm damage 

 since several cover stones were missing. An estimated 80 tons of 

 stone would be required to repair the breakwaters. 



1985 Extensions of the north and south breakwaters of approximately 140 

 and 110 ft, respectively, were completed (Figure 179, hatched ends) 

 for a cost of over $433,000. Cover stones up to 9.5 tons were used. 



1986 The breakwaters, presently, are considered in fair condition. An 

 aerial photo of the Harrisville Harbor breakwaters (prior to break- 

 water extensions) is shown in Figure 180. 



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